'Bicentennial Man' is Christopher Nelson, but I strongly believe that particular credit really belongs to Christopher Allen Nelson. Note that multiple sources, including IMDb and criminalminds.wikia.com/wiki/Christopher_Allen_Nelson already state that Christopher Allen Nelson worked on 'Bicentennial Man', and he's done some puppeteering before ('Kill Bill: Volume 2', for example). As such, I believe that this is Christopher Allen Nelson credited as Christopher Nelson.